juko | 32244dc2ca444838d4bd50f65171bad4d99182bbe5e541afe1120d8812036c37

General

Target
2026-06-28_b491f42778fe3f1629df4976ee5ecce1_elex_wannacry.exe
Size 87KB
Sample260628-yee84adv5k
SHA256 32244dc2ca444838d4bd50f65171bad4d99182bbe5e541afe1120d8812036c37
MD5 b491f42778fe3f1629df4976ee5ecce1
SHA1 04872af4b6422e3aa4490e0a95148d0534027603
SHA512 6874daf685a9bf46c7ba9e91198879bd5828eb247266b0acad4940ed29c31b1ddda907273ee26990bd5284c580b0ad0f6a2d31a5f2bc581b5932144235fc4cd4
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpO:2Ly2Kerc64CiGIm1K851YO6EQkwpO
TLSH
T1B493A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/5932-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85c-5.dat	family_juko
behavioral2/memory/5932-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5564-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4df-13.dat	family_juko
behavioral2/memory/5952-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5952-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5564	WINWORD.exe
5952	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-28459746-3881314244-166055492-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-28_b491f42778fe3f1629df4976ee5ecce1_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4444	cmd.exe
3172	PING.EXE
1656	PING.EXE
2744	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3172	PING.EXE
1656	PING.EXE
2744	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5932 wrote to memory of 5564	5932	2026-06-28_b491f42778fe3f1629df4976ee5ecce1_elex_wannacry.exe	89
PID 5564 wrote to memory of 4444	5564	WINWORD.exe	90
PID 4444 wrote to memory of 3172	4444	cmd.exe	92
PID 4444 wrote to memory of 1656	4444	cmd.exe	93
PID 4444 wrote to memory of 2744	4444	cmd.exe	94
PID 4444 wrote to memory of 5952	4444	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-28_b491f42778fe3f1629df4976ee5ecce1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-28_b491f42778fe3f1629df4976ee5ecce1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5932
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5564
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00003A66" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4444
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3172
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1656
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2744
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:5952

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003A66

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003A66
Size 87KB
SHA256 81b4bddc333501b136f1f18a439cce6ba852f83c074d39b14960b38bcd515256
MD5 63a8c36fcc8f6dc5381885d4d6baa21b
SHA1 75cc7da3d0dc1b8600a5c605d8612ba01c4bc74a
SHA512 2a9b861837825c793d67f222b966e6360c380ddb28fe020f9fdaaba174933b217c8c990865ccfc7b1ae8a30dfdaf0f1a4118ac083a48fc5649179d753261796a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpE:2Ly2Kerc64CiGIm1K851YO6EQkwpE
TLSH
T11193A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 32244dc2ca444838d4bd50f65171bad4d99182bbe5e541afe1120d8812036c37
MD5 b491f42778fe3f1629df4976ee5ecce1
SHA1 04872af4b6422e3aa4490e0a95148d0534027603
SHA512 6874daf685a9bf46c7ba9e91198879bd5828eb247266b0acad4940ed29c31b1ddda907273ee26990bd5284c580b0ad0f6a2d31a5f2bc581b5932144235fc4cd4
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpO:2Ly2Kerc64CiGIm1K851YO6EQkwpO
TLSH
T1B493A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5564-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5932-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5932-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5952-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5952-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads